Update mg_dns_encode_record.md

docs/c-api/dns.h/mg_dns_encode_record.md

@@ -8,11 +8,11 @@ signature: |
                            size_t rlen);
 ---
 
-Encode and append a DNS resource record to an IO buffer.
+Encodes and appends a DNS resource record to an IO buffer.
 
 The record metadata is taken from the `rr` parameter, while the name and data
 are taken from the parameters, encoded in the appropriate format depending on
-record type, and stored in the IO buffer. The encoded values might contain
+record type and stored in the IO buffer. The encoded values might contain
 offsets within the IO buffer. It's thus important that the IO buffer doesn't
 get trimmed while a sequence of records are encoded while preparing a DNS
 *reply.
@@ -21,5 +21,5 @@ This function doesn't update the `name` and `rdata` pointers in the `rr`
 *struct
 because they might be invalidated as soon as the IO buffer grows again.
 
-Return the number of bytes appened or -1 in case of error. 
+Returns the number of bytes appened or -1 in case of error.